Improved Customizable Cable Catcher

Stop your cables from falling off your desk, bedside table, and more! This is a remix of the [Customizable Cable Catcher](https://www.thingiverse.com/thing:547802) by [TheNewHobbyist](https://www.thingiverse.com/thenewhobbyist/designs). It is intended to address multiple issues brought up in the comments, as well as some of my own requirements.

**Customization notes:** There are two known caveats to customization, mostly due to my newness to OpenSCAD. If there ends up being demand, I can address them.

* Customizing/rendering in OpenSCAD requires [BOSL2](https://github.com/BelfrySCAD/BOSL2/)
* Rendering this model in OpenSCAD is a little slow. It takes 1-2 seconds on my fairly-recent laptop.

### New Parameters

**Top/Bottom clip depth:** Adjust the depth of the top/bottom portions of the clip to accommodate for space constraints, such as a shallow overhang.

**Cable diameter:** This is the diameter of the cable hole. I recommend making it 0.5-1mm larger than the largest ca